Which of the following are the main principles of the Parsi religion?
A. good thought
B. good words
C. good deeds
D. all of the above

Hint: Parsis are considered to be the followers of Zoroastrianism in India. Zoroastrians believe in one God which they address as “Ahura Mazda”.
Complete answer: Zoroaster was the coordinator of Parse religion. 'Ahura Mazda' is the name of their beloved God. The elements and components of fire and water are huge in their religion and their importance is of much influence. The holy fire burns-through in the asylums which are known as Agyaris. At the focal point of Parsi acceptance are three essential norms of lead, and these are Good Words, Good Thoughts & Good Deeds.
These three can also be considered the three basic principles of their religion, their core beliefs lie in these ideals, taking into consideration the three.
Now Parsis are the followers of Zoroastrianism in India, it is the world's oldest monotheistic faith. Though it is still unclear where this section originally lived although some scholars believe that they were the contemporaries of Cyrus the Great, a king of the Persian Empire in the sixth century.
Therefore, the option “D” is the correct answer.

Note: It is said that a Parsi as a religion was established when a group of Iranian Zoroastrians emigrated from Persia. They had to do so because they were facing religious persecution by the Muslim majority which took place after the Arab conquest.